Gather all ingredients, ensuring the banana is frozen for a creamy texture.
In a blender, combine the frozen banana, vanilla extract, and orange juice. Blend on high for about three minutes, stopping to scrape down the sides as needed.
Add the yogurt and orange slices, and optionally, the orange zest. Blend again until smooth and creamy.
Check the consistency; if too thick, add more orange juice to reach desired thickness.
Pour the smoothie into glasses and enjoy immediately!
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Notes
Best enjoyed fresh, but can be stored in an airtight container in the fridge for up to 24 hours.